050
FNCA52 TJSJ 130730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SAT JUN 13 2026
DISCUSSION
THE REST OF TODAY, A LOW FIRE WEATHER RISK IS EXPECTED ACROSS THE
SOUTHERN SECTIONS OF THE ISLANDS. BY TONIGHT INTO SATURDAY
(TOMORROW), A DRY AIR MASS WILL MOVE INTO THE AREA, POTENTIALLY
LOWERING RELATIVE HUMIDITY VALUES TO NEAR OR BELOW CRITICAL
THRESHOLDS ACROSS THE SOUTHERN COASTAL PLAINS AND POSSIBLY
ADJACENT AREAS.
BREEZY CONDITIONS WILL GRADUALLY RETURN OVER THE WEEKEND.
COMBINED WITH ABOVE-CRITICAL KBDI VALUES AND INCREASINGLY DRY
FUELS, THESE CONDITIONS MAY RESULT IN ELEVATED FIRE DANGER.
CONDITIONS COULD BECOME FAVORABLE FOR WILDFIRE SPREAD ACROSS THE
SOUTHERN COASTAL PLAINS OF PUERTO RICO ON SATURDAY. A FIRE DANGER
STATEMENT (RFDSJU) MAY BE NEEDED IF CURRENT TRENDS CONTINUE.
PRZ014-132000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 91 (+3) 73 (-2) 92
RH % (24H TREND) 54 (-5) 91 (-1) 50
WIND 20FT/EARLY(MPH) E 19 E 14 E 18
WIND 20FT/LATE(MPH) SE 18 E 13 E 18
MIXING HGT(FT-AGL/MSL)4800 5760
TRANSPORT WND (MPH) E 18 E 22
VENT RATE (KT-FT) 76800 109440
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-132000-
SOUTHERN HILLS-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 88 (+4) 70 (-3) 88
RH % (24H TREND) 58 (-11) 96 (+2) 55
WIND 20FT/EARLY(MPH) E 14 E 14 E 14
WIND 20FT/LATE(MPH) SE 14 E 14 E 16
MIXING HGT(FT-AGL/MSL)5230 6560
TRANSPORT WND (MPH) E 20 E 21
VENT RATE (KT-FT) 88910 118080
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-132000-
NORTH COASTAL PLAINS-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 91 (+1) 73 (-2) 91
RH % (24H TREND) 55 (-10) 97 (+3) 56
WIND 20FT/EARLY(MPH) E 14 E 16 E 16
WIND 20FT/LATE(MPH) E 18 E 12 E 23
MIXING HGT(FT-AGL/MSL)5380 5530
TRANSPORT WND (MPH) E 17 E 21
VENT RATE (KT-FT) 80700 99540
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-132000-
NORTHERN HILLS-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 90 (+2) 70 (-2) 90
RH % (24H TREND) 56 (-11) 97 (+1) 56
WIND 20FT/EARLY(MPH) E 13 E 12 E 14
WIND 20FT/LATE(MPH) E 14 E 9 E 20
MIXING HGT(FT-AGL/MSL)6360 6720
TRANSPORT WND (MPH) SE 15 E 17
VENT RATE (KT-FT) 82680 100800
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-132000-
WEST COAST-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 92 (+2) 73 (-1) 93
RH % (24H TREND) 56 (-11) 94 (0) 53
WIND 20FT/EARLY(MPH) E 17 E 13 E 14
WIND 20FT/LATE(MPH) E 17 E 11 SE 17
MIXING HGT(FT-AGL/MSL)5320 5400
TRANSPORT WND (MPH) E 17 E 12
VENT RATE (KT-FT) 79800 54000
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-132000-
EASTERN INTERIOR-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 20
TEMP (24H TREND) 89 (+3) 71 (-3) 88
RH % (24H TREND) 59 (-7) 98 (+3) 58
WIND 20FT/EARLY(MPH) SE 16 E 16 E 16
WIND 20FT/LATE(MPH) SE 14 E 14 E 16
MIXING HGT(FT-AGL/MSL)5360 6400
TRANSPORT WND (MPH) SE 17 E 22
VENT RATE (KT-FT) 80400 121600
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-132000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 20
TEMP (24H TREND) 85 (+5) 69 (-3) 83
RH % (24H TREND) 66 (-9) 99 (+2) 65
WIND 20FT/EARLY(MPH) SE 13 E 12 E 13
WIND 20FT/LATE(MPH) E 13 E 12 E 14
MIXING HGT(FT-AGL/MSL)4610 4760
TRANSPORT WND (MPH) SE 18 E 22
VENT RATE (KT-FT) 73760 90440
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-132000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 89 (+7) 67 (-3) 89
RH % (24H TREND) 58 (-15) 98 (+2) 55
WIND 20FT/EARLY(MPH) SE 11 E 8 E 11
WIND 20FT/LATE(MPH) SE 11 E 8 E 12
MIXING HGT(FT-AGL/MSL)6240 7750
TRANSPORT WND (MPH) SE 15 E 15
VENT RATE (KT-FT) 81120 100750
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-132000-
CAYEY MOUNTAIN RANGE-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 84 (+3) 70 (-2) 84
RH % (24H TREND) 65 (-8) 99 (0) 63
WIND 20FT/EARLY(MPH) E 13 E 12 E 13
WIND 20FT/LATE(MPH) E 12 E 11 E 14
MIXING HGT(FT-AGL/MSL)4710 5480
TRANSPORT WND (MPH) E 18 E 23
VENT RATE (KT-FT) 75360 109600
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-132000-
VIEQUES-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 20
TEMP (24H TREND) 88 (+1) 75 (-3) 88
RH % (24H TREND) 61 (-3) 89 (-1) 60
WIND 20FT/EARLY(MPH) E 19 E 18 E 18
WIND 20FT/LATE(MPH) E 16 E 18 E 19
MIXING HGT(FT-AGL/MSL)4000 3670
TRANSPORT WND (MPH) E 24 E 22
VENT RATE (KT-FT) 84000 69730
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-132000-
CULEBRA-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 10
TEMP (24H TREND) 90 (+2) 77 (-2) 90
RH % (24H TREND) 59 (-7) 89 (0) 57
WIND 20FT/EARLY(MPH) E 19 E 19 E 18
WIND 20FT/LATE(MPH) E 16 E 18 E 18
MIXING HGT(FT-AGL/MSL)3800 3820
TRANSPORT WND (MPH) E 24 E 22
VENT RATE (KT-FT) 79800 72580
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-132000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 10 10 0
TEMP (24H TREND) 92 (+3) 74 (-2) 93
RH % (24H TREND) 53 (-6) 88 (0) 50
WIND 20FT/EARLY(MPH) E 21 G29 E 19 E 20
WIND 20FT/LATE(MPH) SE 23 E 17 SE 25
MIXING HGT(FT-AGL/MSL)5080 5520
TRANSPORT WND (MPH) E 24 E 22
VENT RATE (KT-FT) 106680 104880
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-132000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 86 (+1) 76 (-2) 86
RH % (24H TREND) 64 (-4) 89 (0) 62
WIND 20FT/EARLY(MPH) E 19 E 18 E 18
WIND 20FT/LATE(MPH) E 17 E 19 E 18
MIXING HGT(FT-AGL/MSL)3620 3610
TRANSPORT WND (MPH) E 24 E 23
VENT RATE (KT-FT) 76020 72200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-132000-
ST CROIX-
330 AM AST SAT JUN 13 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 20
TEMP (24H TREND) 88 (+2) 76 (-2) 87
RH % (24H TREND) 63 (-4) 89 (-1) 61
WIND 20FT/EARLY(MPH) E 20 E 17 E 19
WIND 20FT/LATE(MPH) E 17 E 17 E 19
MIXING HGT(FT-AGL/MSL)4520 4700
TRANSPORT WND (MPH) E 23 E 26
VENT RATE (KT-FT) 90400 108100
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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